What is the yellow spot?

Paganboy

Well-Known Member
Hi guys,

Do you guys know what is the yellow spot on the leaf? Also there are some burns on the tips.

Info of the grow: 11l pots, biobizz light Mix, Greenhouse feeding biogrow and biobloom + enhancer, Tap water (ph around 7,8) with downregulated ph (aiming for 5.9-6.3 with citric acid)

Video link: https://youtube.com/shorts/_a8lpwe2qAo?si=FmFqfGXXHWykVQ4E

I added water check chart on thread.
 

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